/*
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */
#ifndef __LWIP_UDP_H__
#define __LWIP_UDP_H__

#include "lwip/arch.h"

#include "lwip/pbuf.h"
#include "lwip/inet.h"
#include "lwip/ip.h"

#define UDP_HLEN 8

struct udp_hdr
{
    PACK_STRUCT_FIELD(u16_t src);
    PACK_STRUCT_FIELD(u16_t dest); /* src/dest UDP ports */
    PACK_STRUCT_FIELD(u16_t len);
    PACK_STRUCT_FIELD(u16_t chksum);
} PACK_STRUCT_STRUCT;

#define UDP_FLAGS_NOCHKSUM  0x01U
#define UDP_FLAGS_UDPLITE   0x02U
#define UDP_FLAGS_CONNECTED 0x04U

struct udp_pcb
{
    /* Common members of all PCB types */
    IP_PCB;

    /* Protocol specific PCB members */

    struct udp_pcb *next;

    u8_t flags;
    u16_t local_port, remote_port;

    u16_t chksum_len;

    void (*recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
                 struct ip_addr *addr, u16_t port);
    void *recv_arg;
};

/* The following functions is the application layer interface to the
   UDP code. */
struct udp_pcb *udp_new(void);
void udp_remove(struct udp_pcb *pcb);
err_t udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr,
               u16_t port);
err_t udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr,
                  u16_t port);
void udp_disconnect(struct udp_pcb *pcb);
void udp_recv(struct udp_pcb *pcb,
              void (*recv)(void *arg, struct udp_pcb *upcb,
                           struct pbuf *p,
                           struct ip_addr *addr,
                           u16_t port),
              void *recv_arg);
err_t udp_send(struct udp_pcb *pcb, struct pbuf *p);

#define udp_flags(pcb)       ((pcb)->flags)
#define udp_setflags(pcb, f) ((pcb)->flags = (f))


/* The following functions are the lower layer interface to UDP. */
u8_t udp_lookup(struct ip_hdr *iphdr, struct netif *inp);
void udp_input(struct pbuf *p, struct netif *inp);
void udp_init(void);

#if UDP_DEBUG
int udp_debug_print(struct udp_hdr *udphdr);
#else
#define udp_debug_print(udphdr)
#endif
#endif /* __LWIP_UDP_H__ */
